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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fd0e53944a2106c2dcd5df7ee6673cfdd709ee4c1e49880f539dff6d33ad98' 
  AND token = '+rPLlq1Hnec8YJVf4OIa1ltqeAFm9gYg3u4S6NZQqhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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