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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594a8b6ceb4aac1249417a457413ce51a20008fbae66a08e45a3fb41d30ff9fa' 
  AND token = 'yZ9d8kOAdreQLnwMOWyfR7fuc50iN1ywLhHy8TXte8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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