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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11db3116d5601eaf10698618a758ea6bbeb96d7bbaa3bee3feae8486bee521ca' 
  AND token = 'apDO7GR+4xBtkLqh83zhTNiKt0R0W1BHuafHx7bW4WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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