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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe5be283f5e7f36f37e272f07d2536ab8cf3cb6fb3a1e40e3e3bd21799ff18c' 
  AND token = '9qMrXrXX5Gnhl6rqxLGbopDsIWfwXmHcfWinRO5spQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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