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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8d6b0c3f51652c46fa90baa176ae742223bcc7e1befea4d5a8d80b9f4d4766' 
  AND token = '56zsEQpkApa1WEe9KsHIHpAz/pMD4b4zgpq0UpeMZvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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