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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef87795f59e681d5cb28730c9436586e4ebb4af5ddd088f4de9dec29c314ddd' 
  AND token = 'gzJ4iizuTc3/Y13rml7Jzj4KlPuizv8JoF3ZQ5P5Ce0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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