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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1d6693772ce9c17a4e1e639b896b72cd096c1daea38d34c50e661dda1af3f8' 
  AND token = 't6JnqNbaugYSsS/YfzXgHB8W3pGnrhits4RGZdN+P/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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