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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a6d8993b042fd6222361b020a2033eac0453a7b2f04f7e2d93f238a808c9d0' 
  AND token = 'D7pZp9muAPxRrxnANgIa57kH4izacaSZwaUip+W8nF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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