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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ebda1a3904549490f4a3838c897858efc1e01f3075f74ac98f3bbd1cedac3e' 
  AND token = '1vVz2ywtpi9FfMoZYWg6/VfNLXYlfci5rpDjiTwuaCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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