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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5954f17fcb4529510c46adcf3c047565c56c6585ef9f7ca2fc9bda4372913868' 
  AND token = '8zImdws8v77CdkO85Vxyc+QTxBQkS8VI9+fTQdZhEUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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