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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922789ad2bab87544946c09248f80c4ce344a29666dc18f1498b12d3ec98d761' 
  AND token = 'x3heddkX0agWtvCkKMfoxWYas02D7MYqf8fSObZxCQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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