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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb3b94cf008e6ec1ee8cec88fb7d35ef6ac9dee565843a9676c0ba3dcefc4be' 
  AND token = 'ZDwjBKr3FUsjj/Vp1UJNp6Rl2lbPb1g5WZ3a1UAzkN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}