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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074e9d1c8f55354239fbcace3b4a955f073a49619f6e56765256ebe20ec77f5b' 
  AND token = 'AiUxcv4iSRdMyZaSH74sfmZSNHEpv1NghgglvwktWZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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