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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f30d881c640381f3692beccc0d8bfdbac7980b4e677da1f6e7a30347e05586' 
  AND token = 'ulzzJsNVABfdjXYh0m5ME4rZPOIeG6XQkuh/bOs2yS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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