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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411ee85969fcabfa67fb464b38140055d457fcd540158016cb13c11a53b027a6' 
  AND token = '0tdvHYlInsOBpmlg/INNzO3+NIJylcd45L1k4FUa9fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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