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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd863d5333f638351428b73d27af53885b435c3097ffbda3dbd6b1ab29f20616' 
  AND token = 'kptOIsJRXi1/UgEfhxZ/a7RiaEAVkrqxKJ8lGIkjReM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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