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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b088f1f49fa997fa1e14c29b5f1343b3083159f88899139c505ad65ee1621d1b' 
  AND token = 'bgX5MnzEj5flIiy8US1M6VOmAb5yEzIydH2LGKZcJxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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