SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96df2e9c85cca9c444d26073b41c859defa90596e9b5b83566a6648056319a3e' 
  AND token = 'QOdTgwRRaNhR0TDGYCg/+x0Uf8UnftdOQBmUu/P3Ces=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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