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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5ff13e61c555a282f68b49f7608123bfc0e2aa6c22c4b2d00c54ccb1bcdbcc' 
  AND token = '7VPSdW0uGUzgFPyMgOmDSHs5zzIXb3tbmh9ns9qx0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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