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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb142d9c0e37f897f69edd2fa81e75f3a51604cc47002cdf20ad5a98a491dfda' 
  AND token = 'FcO7KJtklzhNPz1m7RVa9kZa+6/xfck05BP9//6YLFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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