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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4889abf4a6b95998debface5c7ed51c3e5ad39582929f1f54081961cc370b5a' 
  AND token = 'jwpPbDnpgtZa8inom3PGm1D6zV/BR3Y4gDX5GWEn4UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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