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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93a3f4a44f21808dc0aaa52cbb26f5e970477d34a3de71e77bb1b80ea49db54' 
  AND token = '00vlXKreWMI8GZouaAM/Jtpuu1drrGKOGeAHPYiCxME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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