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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee2b0a38cc49bc966064fd58fd991a292f12b6f92d7049f0822cb840a1feba3' 
  AND token = 'hlK0dZdGhvtLS1kqjzLbH29f7+NIypb9mTTU81bfuHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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