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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8434bfb5599162a155e561c0d7352f2326af7590e12b408d734cd82a9c3d9dcc' 
  AND token = '2vOdV2o/Hk+Spj52H1TBXCWGkR8ZiAP3VikES1LpxII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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