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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070b2bdc45438899df6565e5a290c89033aa88366a0613a76cb5f4380f0153ce' 
  AND token = '4Qmxr/ivWGu1FlD4nZpWS7Gz4nPOXqalcG7TNSX4VBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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