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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1833acd3e476ffd756d907772927f1939eda4dc9566e707bced01b7be336060f' 
  AND token = 'ObSNvNTIjOd1kyuSYf9hxIcrdOmRzKhhrNorNf2UeaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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