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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219d067ec063c324b780c55741c368a6419343ac6cca18f760f36b4efd716dea' 
  AND token = 'E962DyycEyZiC7RwmrDZSUyPo7qT3rfBOrxF6uYOHDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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