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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8b95b47ccaa75c05fea8e48e08a5f1be58d2914c66b03fb1f0c4f4555082bd' 
  AND token = 'SsI+6+JkhTcOIaE4th3oY+CsVWZEJZ+97SjUTM8UGF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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