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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c882fbc9c79c6fb3be518742b6bf122f5c87d6f10a7972609c17e5974138eb' 
  AND token = 'jupgx+49Ia711+kiTPg5xdd0rPRSp6/NNMW7ZRNlbW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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