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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78afe518ccb4f59c1a0b67aba83b8a80ac01076f8b99f235439b092a6a012605' 
  AND token = 'kgG6jjPsUr9HX7A+tZtkmOOZ0cTdeWaolXZtXIKjrMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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