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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7ec05b5d993a6af71c7ff7e7b1f4d8139fda0c9d19111f935cc0ed313a2de0' 
  AND token = 'i90gSiTVo5nM7kDw+ooxC6kUALipwzhs+St1jMiOfH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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