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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a082b94a17154069df252126e5856ac02e4a7039205a8ccf0b2dbd6f38bfe1' 
  AND token = '7IWgYYHjX6pbsAxnQeAbs3heharn9ce5+x4yrx6I8qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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