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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb6b1f611dd006e6db92e451dc5409feb9b5a18c50f4706b1098b834541885c' 
  AND token = 'N5oEkz1ObcT2j/qDpeV2zV5ObN7zR6gOCdw6jvebiUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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