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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7625a7f0d110f5e3f0631ecdcc0848b1587c48b8443fdc8cfdeaf012c8612f7f' 
  AND token = 'yNabyV+LBgvV9Hb6qIcnTM3lomXkbuPrlxDJXt1u7zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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