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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be786a3c758cce9f11ec899555ee61e0ddf29a2ae0f6597ca4be711c3ee4245a' 
  AND token = 'UGTQnt0OYrRUcCkucQbi2Jx5smSNwN1HU3IIeQm5jrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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