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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dd5816fc2a7f38870a218f10d3904156384978d6195babf56125827360fbf9' 
  AND token = 'MjTO6W94D4kl9I/CLslj3/GfmP3WsCB8d8pxAUevMTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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