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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6f3bd1cc82699bfd53fd80028130d7821c5614fb47992f4b02ef926a509211' 
  AND token = '2SStRyYqEYLfxSBckCgueH9Y/wtrRy4k7XdeNnjm3GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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