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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7ebb18dfbfa46bcbb581a9e804f839a2106ecbe6c0395f90cc83848d587ba8' 
  AND token = 'usbYnmeDLB0GRtWL0qvB/0nI9Xlx3qAAmUgr9M03EE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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