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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd311a81edfb059f73d0d65f3d1a842363017b8aa92c638e0e93d772ead3602' 
  AND token = 'aIzFO0GpWavM8zZh5nWAZv4VAzScN5DYtKC2I5IFryM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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