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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0def8354911f29c755d6c7e22e6096323114bf5eb24c7c6ea50f156d52308506' 
  AND token = 'uOTuJUhah+0HiEx8p28oVdUjS/HUIBt8iVMmScMU5Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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