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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f68c065ab0bfb5dbbb958f5228277a437db66d1d8ca7cfa76ae5fb92d1ae2d5' 
  AND token = 'lOAybDrS98d/bk9etUKwZeaKMof4SkzDfLNU78Y4PFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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