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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b748bfeebe59e8507ecc63531b7c15197f909f7aa4a3d06fb6b901d12168aba' 
  AND token = 'ZfTlQ3Ua8ceyiwV+GQcSyLIWmR2ZIH2yXh0/uZB+9sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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