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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ad7621b448a66d8a59a89400c14c53ad402040ba310af4e222f754b9c73ae7' 
  AND token = 'AeDYhbMG39ElEZ2M1M1cyaaayBbod6X1jPBD886XBDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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