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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46129a023bfd7e3e7c7822676d10a0e67bd2513dafb4b329748a8ac3c7ff7cb4' 
  AND token = 'KG5Rgg1C+pmL92XNv94CCHPkdDvXR4Sue2c8//5YoIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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