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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12f56713bbb6e2d50e84df50eedaf117c80638495d4a5e6f50a212af252c500' 
  AND token = 'tDtTw019ExgGBssPf/6EKzfYqYFRp/Bli/t4cvTwFoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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