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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb12fc428307f12a9984ca873f7a9565585efabf160c4e6d8e9ed0e1aee3292' 
  AND token = '7J7vUI21jROdiX+1tPykHqE5X3XpXgQmYJ4zRiI9Ueg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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