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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113a9c21630e179161961f19fb53505665d79e59d8643256afc18d13038cd0e2' 
  AND token = 'Vhe71vD4UNOuekF/0Xopk8gz8Z1GfEDfaE4jzZGYG+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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