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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63c4c2e25b45da9580451f51191f108e34b149e5ca3156705a22cb1df326273' 
  AND token = 's8mt/vOQcbkdK9jsQRhi/Sypy4rN49rXlXySKaLPdcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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