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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1a046a1bbff6bc7b96c9af24770f5f4cf53649a06725506350d5d72d3f08ee' 
  AND token = '0srvKYH4jYtwoU07/NjeuPm7K9OyJYN7iwkxu3VAAto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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