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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa80a5faeed6833f75aeb3ed2e0bac948f2774de789a869aac1014aad0044626' 
  AND token = 'CgQQfvbZopqpHzBZjoav5c7G3v5h3p3vXP0WSHGqL6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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