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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb80dadb8e1d70fb8d205bc91858a9ddde93a4642a54d679e11c8bbba0e1490' 
  AND token = 'hQONSmb9VV7Q2uhJFKfuym5FSxvMwYwmcAaX60gaRoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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