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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4680d1012613e3467e9a421f4527fe29c19fd94fa6bb03076015db58457e583' 
  AND token = 'j4Xo2n1Yl2T5/4/1jSH1y5n4VO6lzesIPNMcwokSrP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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