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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f0cff50dbfdb9a4f2ddc7e3682f42b4c4f564f211e9108fa6ed55b5780481d' 
  AND token = 'q2beNwjdoekR9agqmGHFcFy7FtTMjZSoIVqN3lLqh1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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