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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a264edbd28b8dca9b642151c45632f2f4d3037860c1aebc831677643b25d507' 
  AND token = 'YzxJoEveLhStRH1XQc4vZMqEVP7OkTSvVNUArTF/7uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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