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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32303a49921d5c3c41c31185e351bd36efce517cc9ce83720a928dcd9b3cfef' 
  AND token = '6DJRwlkZnYkNS/CMeZ71Yz8nQBdJL6vxbaXA2p8/eMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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