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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fad3d93e643ebd21efec31b6e12823c0af8003e69e6d77eed41f101d058289d' 
  AND token = 'jNwXhmRr9am6WOpgVc7tJHmyLZMjZFvNxoqc6Fjsszc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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