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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf4745ef2cab8d5cb1aa7688b1cb7695368787ac8350c33e159f9eb3a9082df' 
  AND token = 'WkvQuT2Om5kFqVRgzNgY6X1/dad+cW9UYYgFbTCBags=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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