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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebfbb1567cf68c103b009cb4ac165ffdee0b6a6e147c650855e3c626b9dc44c' 
  AND token = 'IfyLmfbMkXALfkbcsdOXvNe7ICv5LsCE0N8YVbNqPQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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